Rumer Willis steps into the spotlight as she premieres her new film in London

Carving a name for yourself in Hollywood is hard enough, especially when you have famous parents.

But Rumer Willis is determined to step out of the shadow of her father Bruce Willis and mother Demi Moore and become a famous actress in her own right.

Attending the premiere of her new movie Sorority Row in London last night, the 21-year-old showcased a more feminine look.

My time to shine: Rumer Willis attends the London premiere of her new film Sorority Row in London's Leicester Square last night

With new long hair extensions in place of her usual shorter crop, Rumer worked the girlie look in a salmon Zac Posen tea dress and black Fendi platform heels.

She joined her close friend and co-star Briana Evigan, 22, at the screening of the horror film at the Vue West End cinema in Leicester Square.

In contrast to Rumer's frilly outfit, Briana went for a more figure-hugging sexy BCBG Max Azria blue and orange dress and stiletto heels.

After the premiere, the two actresses decided to see what London's nightlife had to offer and spent the night partying at Bungalow 8 and Movida till 3.30am.

Popping outside Movida for a cigarette break, Rumer and Briana rested their feet and sat down on the steps of the famous Palladium Theatre.

BFFs: Rumer and her co-star Briana Evigan have struck up a close friendship after making the film

The two women struck up a friendship on set of Sorority Row earlier this year and Briana attended Rumer's 21st birthday party in Las Vegas earlier this month.

Since arriving in the capital earlier this week, Rumer and Step Up 2: The Streets star Briana have been working the publicity trail by speaking to the press and appearing on shows like GMTV and ITN News.

But after turning 21 just 11 days ago, Rumer is still ready to party and is planning to see as much of London's nightlife as possible.

She said: 'I have no idea where to go in London. I noticed a few karaoke places and I guess they will be fun.'

Sorority Row tells the story of a group of sorority sisters at a U.S. university, who accidentally kill one of their group and end up being stalked by a serial killer.

Fag break: Rumer and Briana enjoy a cigarette on the steps of the London Palladium

Ready to party: Rumer and Briana spent the evening partying at Bungalow 8 and Movida, before heading home at 3.30am

The film is just the latest in a string of movies starring Rumer, but is predicted to be her most successful yet.

She starred alongside Anna Faris in comedy The House Bunny last year and has several film roles, including a recurring role in TV show 90210, coming up.

Despite her famous parents, Rumer insists she has to work hard to establish her film career.

She said: 'Having a famous name can be a help.But everyone has opportunities and, in the end, if you are talented, you'll get work.

'If you're not, you won't. And my parents have always been supportive.'

Rumer said she had an unusual childhood growing up with such a stunning mother, admitting Demi wears a small dress size than she does.

She said: 'Growing up with a mother like mine gives you a skewed idea of what a mother should look like. My mother's jeans are smaller than mine.'